Dynamically adjustable annular laser trapping based on axicons

Bing Shao, Sadik C. Esener, Jaclyn M. Nascimento, Elliot L. Botvinick, Michael W. Berns

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


To study the chemotactic response of sperm to an egg and to characterize sperm motility, an annular laser trap based on axicons is designed, simulated with the ray-tracing tool, and implemented. The diameter of the trapping ring can be adjusted dynamically for a range of over 400 μm by simply translating one axicon along the optical axis. Trapping experiments with microspheres and dog sperm demonstrate the feasibility of the system, and the power requirement agrees with theoretical expectation. This new type of laser trapping could provide a prototype of a parallel, objective, and quantitative tool for animal fertility and biotropism study.

Original languageEnglish (US)
Pages (from-to)6421-6428
Number of pages8
JournalApplied Optics
Issue number25
StatePublished - Sep 1 2006
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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